Canon BG-E8 Battery Grip for EOS Rebel T2i/T3i/T4i Digital Camera. The Battery Grip BG-E8 holds up to two LP-E8 battery packs or six AA Batteries to offer double-length shooting time. The vertical shutter release makes shooting with the camera in a vertical position just as comfortable as shooting horizontally. The following functions are available in the vertical shooting position. Shutter-Release, Main Dial, AF Point Selection, AF/FE Lock, Index, Aperture, Exposure Compensation Button, Reduce Button. Vendor Part # 4516B001